Until 1961, the widespread belief was that the human somatic cell was immortal. in the sense that there was no theoretical limit to how many times it could divide. In 1961, Leonard Hayflick discovered otherwise.Read more.

Back in the day, I devoted some activity directly to Facebook, but nowadays I use Facebook for only two things: convenient alternative login to various other websites, and for automatic re-posting of the posts I make (such as this one) in my blog in my personal website. I do not check anything on Facebook. In particular, I currently have over 50 notifications that I haven't looked at. How to do know? Because occasionally Facebook sends me an email reminding me of my notifications that I have not read. fyi. Have a nice day.